Window-sash lock.



A. FISCHER.

WINDOW SASH LOCK.

APPLIOATION FILED SEPT. 24, 1913.

Patented Apr. 28, 1914.

COLUMBIA PLANOGRAPH co..\vAsH|NGTON, D4 c IN VE/VTOR ATTORNEY ANTHONY FISCHER, OF INDIANAPOLIS, INDIANA.

WINDOW-SASH LOCK.

Specification of Letters Patent.

Application filed September 24, 1913.

Patented Apr. 28, 1914.

Serial No. 791,495.

To all whom it may concern:

Be it known that I, ANTHONY FISCHER, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful lVindow-Sash Look, of which the following is a specification.-

The object of my invention is to produce a device, readily attachable to the ordinary double sliding window sash, by means of which opening movement of the sash beyond predetermined points may be prevented, the construction being such that, when properly manipulated to permit greater opening movement of the sash and the sash subsequently returned to closed position, the locking mechanism will be automatically thrown into active position.

A further object of my invention is to so form the parts that when in active position they will serve to firmly hold the two sash together so as to prevent lateral springing.

In the drawings, Figure 1 is an elevation of a pair of window sash provided with my locking device; Fig. 2 a vertical section on line 2-2 of Fig. 3, showing my improved lock and adjacent portions of the sash; and Fig. 3 a section on line 3-3 of Fig. 2.

In the drawings, A and B indicate sliding sash of ordinary form. Mounted upon the top rail of sash B is the main body 10 of my lock, said main body comprising a horizontal plate having extended dove tailed fingers 11, 11 and a pair of upright flanges 1212. Pivoted between the flanges 12, 12 is a locking dog 13, the weight of which normally produces movement in the direction indicated by the arrow in Fig. 2. J ournaled in flanges 12, 12, in notches 14, formed in the upper edge thereof, is a shaft 15 provided with a cam 16 arranged to engage dog 13 and, when thrown into proper position, to throw the locking dog out of active position, as indicated in dotted lines in Fig. 2. Shaft 15 at one end is provided with an operating head 17 which is conveniently set sufficiently eccentric to the shaft 15 so that its weight will serve to carry the cam 16 to its lowest position as soon as it has been fairly started toward the position shown in full lines in Fig. 2. The opposite end of shaft 15 is provided with a radially extending arm 18 the purpose of which will appear.

Secured to the side bar of sash A is a.

plate 21 the edges of which are under-cut, as indicated at 22 in Fig. 3, to interlock with the dove-tailed fingers 11 of main body 10 and the upper end of this plate is rounded or tapered so that the parts will readily come into interlocking engagement with each other as the lower sash is moved toward its closed position. Plate 21 is provided throughout its length with a plurality of shoulders or ratchet teeth 23 beneath which the free end of the locking dog may take to prevent upward movement of the lower sash or downward movement of the upper sash. Plate 21 is also provided with a longitudinal slot 24 in which the free end of arm 16 will be projected when the locking dog 13 is thrown to inactive position, the arrangement being such that the upper end 26L of slot 24 will, when the sash is sufficiently raised to bring the free end of the locking dog 13 above the last shoulder 23, engage lever 18 so as to withdraw cam 16 from beneath the locking dog and permit it to return by gravity to its normal position.

In operation, the dog 13 may be set to engage any one of the shoulders 23 and thus limit any further opening movement of either sash, the fingers 11 interlocking with the plate 21 so that no matter what force may be. applied, tending to shift the windows in opening direction, the lateral pressure of the locking dog cannot be utilized to spring the sash laterally and thus permit the sash to be moved past the locked position. Whenever greater opening movement of the sash is desired, cam 16 will he swung up beneath the dog 13 so as to swing the free end of the dog out of active position, but immediately upon the dog being carried past the upper shoulder 23, arm 18 is engaged so as to retract the cam 16 and thus permit the locking dog to return toward its normal position, so that when the lower sash is finally brought to, or nearly to, closed position, the locking dog is autoi'natically in its locking position and therefore does not need any attention by the householder to lock the sash.

I claim as my invention 1. A sash lock comprising two mating members having laterally interlocking portions, a locking dog carried by one of said members and engaging the other member to limit relative movement in one direction, a member for moving said locking dog to inactive position, and inlerengaging means between said last mentioned member and one of the two first mentioned members to automatically release the locking dog upon suffieient relative movement between the two first mentioned members.

2. A sash lock con'iprising two mating members, a locking dog carried by one of said members and engaging the other memher to limit relative movement in one direction, a member tor moving said locking dog to inactive position, and interengaging means between said last mentioned member and one of the two first mentioned members to automatically release the locking dog upon'sullieient relative movement between the two first mentioned members.

3. A sash lock comprising two mating members having laterally interlocking portions, a locking dog mounted in one of said members and engageable with the other to limit relative n'ioven'ienl in one direction, a cam jonrnaled in the dog-carrying member and engaging the dog to shit": the same to inactive position, an arm connected with said cam, and a portion carried by the other member to engage said arm and automatically retract the cam upon suilicient relative movement between the two first mentioned members.

-l. A. sash lock comprising two mating members, a locking dog mounted in one of said members and engageable With the other to limit relative IHCYPmQIlt in one direction, a cam journaled in the dog-Carrying member and engaging the dog to shift the same to inactive position, an arm connected with said cam. and a portion carried by the other member to engage said arm and auto-mati callv retract the cam upon sutfieient relative movement between the two first mentioned members.

it sash lock con'iprismg two members tor attaclnnent respectively to the two sash cooperating with the ratchet teeth of the first member, a pivoted cam carried by the pawl-carrying member and cooperatin g withsaid pawl to move the latter to inoperative DOSltlOH relative to said ratchet teeth. a finl.

ger movable with said cam, and a stop associated with said toothed member and eo operating with said finger to move said cam toward the position in which it allows said pawl to be operative.

ti. A. sash lock comprising two members ea er? for attachment respectively to the two sash of a window, one of said members being provided with ratchet teetlna pivoted loching pawl carried by the other member and cooperating with the ratchet teeth ol? the first member at an oblique angle to such first member, a pivoted cam carried by the pawl-carrying member and cooperating with said pawl to move the latter to inoperative position relative to said ratchet teeth, a tin ger movable with said cam, and a stop associated with said toothed member and (o operating with said finger to move said cam toward the position in which it allows said pawl to be operative.

7. A sash lock comprising two members for attaclnnent respectively to the two sash ot a window, one oi said members being provided with ratchet teeth, a pivoted locking pawl carried by the other member and cooperating with the ratchet teeth it the first n'iember, a pivoted cam carried by the pawl-carrying member and cooperating with said pawl to move the latter to inope ative position relative to said ratchet teeth. said cam being biased to a position where it allows said pawl to be operative and said pawl being biased to operative position. a finger movable with said cam. and a stop associa ted with said toothed. member and cooperating with said finger to move said cam toward the position in which it allows said pawl to be operative.

8. A. sash lock comprising two members for attachment respectively to the two sash of a window, one oil said members being provided with ratchet teeth. a pivoted loching pawl carried by the other member and cooperating with the ratchet teeth oi? the first member, a pivoted cam carried by the paw l-earrying member and cooperating with said pawl. to move the latter to inoperative position relative to said ratchet teeth. said pawl being biased to operative position, a linger movable with said cam, and a stop associated with said toothed member and cooperating with said finger to move sa'tl cam toward the position in which it allows said pawl to be operative.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this -ilnd day oil September, A. l). one thousand nine hundred and thirteen.

ANTHOE "1'' B16 "l lliii.

\Yitnesses: 7

ARTHUR M. Boon, FRANK A. Far-jinn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C. 

